2. A 1.o 1:O at 0°C is initially in contact with a mysterious solid object X at

Question

2. A 1.o 1:O at 0°C is initially in contact with a mysterious solid object X at 160 C Both matte in a thermally insulated container and eventually reach thermal equilibrium at 0°C. H2O tur quid completely, and the object & remains solid ) Find the amount of heat transfer on () the H:O, and (ii) on the object X E: 3.35 (b) The mass of the mysterious solid X is 5.37 kg. Find its specific heat. Check your numerics with the table below. What is the object X made of? 35 los 537.5.16 Substance Melting/Boiling Points Latenteat of Latent Heat of Vaporization Lv Specific Heat Fusion Lt J/kg /(kg.K) H20(s) H20) H20) 2090 4180 886 273/373 3.35 x 105 2.256 × 106 2.473 x 10 3.999 × 105 2.035 × 105 Iron(s) 1811/3134 6.09 x 10 Al 930/2790 10.9 × 106 900 39 Cu(s) 1358/2835 473 × 106

Explanation / Answer

(A) amoumt heat transfer to H20 = m Lf

= 1 x 334 kJ  

= 335 kJ   

(ii) amount of heat trab sfer will be same.

Q = 335 KJ

(X provided (released) this heat whether H20 absorbed)

(b) Q = m C delta(T)

334 kJ = 5.37 x C x (160 - 0 )

C = 0.389 kJ / kg deg C

( this is Cu )

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